The nitrogen cycle By garikaib|2022-09-15T12:40:20+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes| Nitrogen fixing roots in legumes. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The nitrogen cycle Nitrogen makes up 79% of the atmosphere Animals cannot absorb Nitrogen as a gas They absorb it indirectly usually as part of food Recycling of nitrogen is carried out […]Quick NetOne, Econet, And Telecel Airtime Recharge Number to recharge: Airtime amount ($): EcoCash number: Buy {{error_message}} {{error_message}} Read More Comments Off on The nitrogen cycle